RC-Boss,

Thanks for your response. I thought the gears were metal!! I looked at the one that was removed by the LHS and said "these look like they are already metal". The response was "nah....that's just silver grease". I think your right about the expertise.

Anyway, to be honest, I'm not yet sure that the problem I'm experiencing now is a diff problem. About halfway through the first battery, it started to make a "clicking" noise. When I spin the main gear there are a couple of rough spots. It does not appear to be the main gear/pinion mesh, but I have not worked on it yet to try and find the culprit. I will do that this weekend.

I ordered the cable from Castle, it is on back order for 1 to 2 weeks. I have not driven it, and won't until I figure out what the problem is. I don't want to make it worse in case it is "fixable". I did program it using the Tx for the lowest throttle response (they call it "take-off" power I think). But you're right, I didn't know there was more control of the Mamba program. I have worked on electronics and computers since the "tube" days (my specialty is Terminal RADAR and Automation systems). I understand programing processes and look forward to "tweaking" this little turd.

I will check it out with a fine tooth comb and see what I can figure out.

Question: If it is a diff again, it may not be too late for it. If it can be shimmed, are there kits available or instructions on how to do it somewhere you can direct me to. Any help here would be appreciated. I am quite mechanically inclined, but have never torn into one of these little things!

Thanks again for your help. As I said, it's important I resolve this problem because we love it and "chomp at the bit" to run it!

Hoot